Biomedical and Environmental Interdisciplinary Research Centre , Hefei 230010 , P. R. China.
Langmuir. 2018 Aug 7;34(31):9264-9271. doi: 10.1021/acs.langmuir.8b01413. Epub 2018 Jul 25.
Magnetically recyclable photocatalyst has drawn considerable research interest because of its importance in practical applications. Herein, we demonstrate a facile hydrothermal process to fabricate magnetic core-shell microspheres of FeO@Zn CdS, successfully using FeO@ZnS core-shell microspheres as sacrificed templates. The as-prepared magnetically recyclable photocatalysts show efficient photochemical reduction of Cr(VI) under irradiation of visible light. The photochemical reduction mechanism has been studied to illustrate the reduction-oxidation ability of the photogenerated electrons (e) and holes (h), which play an important role in the reduction of Cr(VI) to Cr(III) and oxidation of organic dyes. The as-prepared FeO@ZnCdS core-shell microspheres show good chemical stability and only a slight decrease in the photocatalytic activity after four recycles. In particular, the as-prepared photocatalysts could be easily recycled and reused by an external magnetic field. Therefore, this work would provide a facile chemical approach for controlled synthesis of magnetic nanostructures combined with alloyed semiconductor photocatalysts for wastewater treatment.
磁性可回收光催化剂因其在实际应用中的重要性而引起了相当大的研究兴趣。在此，我们展示了一种简便的水热法来制备 FeO@ZnCdS 磁性核壳微球，成功地使用了 FeO@ZnS 核壳微球作为牺牲模板。所制备的磁性可回收光催化剂在可见光照射下表现出高效的光化学还原 Cr(VI)的性能。研究了光化学还原机制，以说明光生电子(e)和空穴(h)的氧化还原能力，这对 Cr(VI)还原为 Cr(III)和有机染料氧化起着重要作用。所制备的 FeO@ZnCdS 核壳微球表现出良好的化学稳定性，经过四次循环后，光催化活性仅略有下降。特别地，所制备的光催化剂可以通过外加磁场轻松回收和再利用。因此，这项工作为控制合成与合金半导体光催化剂相结合的磁性纳米结构提供了一种简便的化学方法，可用于废水处理。
